Synonyms for Pair (same or very similar meaning)
WordNet sense 1 (two items of the same kind):
brace, couple, couplet, duet, duo, span, twain, twosome, yoke, distich, duad, dyadWordNet sense 2 (form a pair or pairs):
pair off, partner offWordNet sense 3 (occur in pairs):
geminateWordNet sense 4 (make love):
mate, mateWordNet sense 5 (bring two objects, ideas, or people together):
match, twinFrom the ODE community, based on WordNetadd/edit